Events

1898 – Spanish–American War: American troops enter the city of Mayagüez, Puerto Rico.

1918 – World War I: The Battle of Amiens ends.

1929 – Babe Ruth becomes the first baseball player to hit 500 home runs in his career with a home run at League Park in Cleveland, Ohio.

1934 – The first civilian prisoners arrive at the Federal prison on Alcatraz Island.

1942 – Actress Hedy Lamarr and composer George Antheil receive a patent for a Frequency-hopping spread spectrum communication system that later became the basis for modern technologies in wireless telephones and Wi-Fi.

1965 – Race riots (the Watts Riots) begin in the Watts area of Los Angeles, California.

1972 – Vietnam War: The last United States ground combat unit leaves South Vietnam.